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Image zooming method based on edge detection

A technology of image scaling and edge detection, applied in image data processing, graphics and image conversion, instruments, etc., can solve problems such as blurred edges or jagged edges, affecting judgment accuracy, and failing to achieve good edge scaling effects

Active Publication Date: 2005-09-14
HANGZHOU NATCHIP SCI & TECH
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Problems solved by technology

This method does not take into account the edge characteristics of the image, which will inevitably cause blurred or jagged edges
The invention patent with the application number US6832009B1 discloses an edge-based interpolation algorithm. Although this method takes into account the similarity between the target point and adjacent points, it does not take into account the continuity of the edge, and only judges based on the target point and adjacent points. The direction of the edge will inevitably affect the accuracy of judgment, and cannot achieve a good edge scaling effect

Method used

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  • Image zooming method based on edge detection
  • Image zooming method based on edge detection
  • Image zooming method based on edge detection

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Embodiment Construction

[0043] figure 1 The method of the invention is illustrated. The input image first obtains the coordinate position of the interpolation point according to the equations (1-1) and (1-2). For the specific obtaining method, please refer to figure 2. Then judge the edge characteristics of the input image. When judging, first set an adjacent row on the target pixel, and use equation (2) to calculate the similarity between each direction and the target point with three horizontally connected pixels as a group. After calculating the similarity between each direction and the target, the edge direction K0 of the target point can be obtained through equation (3). After calculating the edge characteristics of each pixel of the original image, according to the edge characteristics of the position of the point to be interpolated, if it is a non-edge area, select equation (5) to interpolate in the horizontal direction, and use bilinear interpolation in the vertical direction Calculation...

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Abstract

The invention relates to an edge-detection-based image enlarging and reducing method. Traditional method would produce ambiguity and saw teeth on the edge of enlarged and reduced image. This invention comprises: (a) making use of the size of image fore-and-aft enlarging and reducing to obtain position in coordinate of point to be insert in original image, (b) making use of space coherence among picture elements of image to judge existence of edge with recursion and confirm direction of edge, (c) making use of edge of property judged in step (b) to employ cubic convolution interpolation in non-edge area and employ bilinear interpolation in the edge direction in fringe area.

Description

technical field [0001] The invention belongs to the technical field of image format conversion, in particular to an image scaling method based on edge detection. Background technique [0002] At present, the types of display devices are becoming more and more abundant. In addition to traditional CRT scanning TV displays, there are also a large number of digital flat panel or projection displays such as PDP, LCD, DLP, and LCOS. These displays are different due to their own characteristics and applications. , each with its own optimal display size. On the other hand, the size of image signals input to these display devices also has a wide range of change. Based on this, it is necessary to reduce and enlarge the image. In addition, in order to make the user focus on a certain detail of the image or obtain an overall overview of the image, it is also necessary to zoom in on the image. [0003] Traditional image scaling methods, such as nearest neighbor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40
CPCG06T3/403
Inventor 陈涛叶丰周艇张明
Owner HANGZHOU NATCHIP SCI & TECH
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